"DXGI_ERROR_NOT_CURRENTLY_AVAILABLE: The requested functionality is not supported by the device or the driver. (-2005270494)"

after around 10 minutes of idling. I had been playing for 20 minutes beforehand, however it crashes only when I idle in one place for long periods of time. I have repeated this around 3 times, and ever time its when I have left it on idle for long periods of time.

Yeah you pretty much got it apart from its not anything to do with fullscreen.

I tried chatting on steam whilst playing. I type at around 100Wpm and I think it is to do with the speed I am hitting random buttons, the screen moved everywhere. I hit the 'g' key around 10 times during typing and it took around 10 seconds to crash. Simple solution to this would obviously be to not allow the game to respond when the window is not focused I suppose, not sure what thats like to do. For the meantime I would just suggest not typing with the game open